The correct answer is A. Gulf of Mexico.
The Gulf of Mexico is an extension of the Atlantic Ocean located between the southeastern United States, the northern coast of Cuba, the western coast of Hispaniola, and the northeastern coast of Mexico. It is the largest gulf in the world, covering an area of 1.6 million square kilometers (620,000 square miles). The Gulf of Mexico is a major economic region, producing oil and gas, seafood, and tourism.
The Persian Gulf is an extension of the Indian Ocean located between Iran and the Arabian Peninsula. It is the second largest gulf in the world, covering an area of 240,000 square kilometers (93,000 square miles). The Persian Gulf is a major oil and gas region, and is home to the Strait of Hormuz, a vital shipping route.
The Gulf of Carpentaria is an inlet of the Coral Sea located in northern Australia. It is the third largest gulf in the world, covering an area of 230,000 square kilometers (90,000 square miles). The Gulf of Carpentaria is a major fishing region, and is home to the Gulf of Carpentaria Marine Park.
The Gulf of Mannar is an inlet of the Indian Ocean located between India and Sri Lanka. It is the fourth largest gulf in the world, covering an area of 100,000 square kilometers (39,000 square miles). The Gulf of Mannar is a major fishing region, and is home to the Gulf of Mannar Marine National Park.